Idea: A card that, when used on an upgraded card, gives a small % chance that the target card will become a permanent addition to your deck.
Pros: Would allow you to upgrade cards with blessing/momentum/devour/etc, and if the card is successfully copied to your deck, it will always go into play with those permanent modifiers.
Cons:
1. If the spell fails, the target card is permanently deleted from your deck.
2. The chance for success would be extremely low (0.5% or so).
3. Every bonus modifier increases the quantum cost of the card. Something like:
Every additional attack: +2 summoning cost.
Every additional defense: +1 summoning cost.
Immortal: +10 summoning cost
Momentum: + 4 summoning cost
Poisoned: -1 summoning cost for every counter
Frozen: -1 summoning cost
So on and so forth.
4. "Alternate Reality" cards all count as both their target creature and as a general "alternate reality" creature, so you can only have 6 of them in your deck at any given time. (E.g. you couldn't have 6 AR otyughs and 6 elite otyughs in your deck, and if you already have 6 AR otyughs in your deck, you can't put another AR card in.)
Balance Issues: The possibility of gaining permanent, powerful cards is offset by the extremely slim chance of it actually working, and the increased cost of summoning these powerful creatures. Additionally, since it can only be used on upgraded cards, the average cost per card achieved this way would be somewhere in the ballpark of 30,000 electrum (assuming a 0.5% success rate). Finally, you could only have 6 of these in your deck at any given time.
